One vertex per element, one color per generator, with an edge from x to x·s.
(9,10)(11,15)(12,20)(13,14)(16,21)(17,18)(19,23)(22,24)(25,26,30,35)(27,33,38,31)(28,39,37,32)(29,40,36,34)(1,2)(3,7)(4,6)(5,8)(9,10)(11,17)(12,20)(13,14)(15,18)(16,21)(19,22)(23,24)(25,27,30,38)(26,31,35,33)(28,36,37,29)(32,34,39,40)(1,2,4,6)(3,5,8,7)(10,14)(11,18)(16,20)(19,24)(25,26)(27,31)(28,39)(29,34)(30,35)(32,37)(33,38)(36,40)(9,10)(11,15)(12,16)(13,14)(17,18)(19,22)(20,21)(23,24)(25,28,30,37)(26,32,35,39)(27,36,38,29)(31,34,33,40)(1,2)(3,5)(4,6)(7,8)(9,11)(10,15)(12,19)(13,18)(14,17)(16,22)(20,23)(21,24)(25,27)(26,33)(28,36)(29,37)(30,38)(31,35)(32,40)(34,39) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,12)(10,16)(11,19)(13,21)(14,20)(15,22)(17,23)(18,24)(25,29,30,36)(26,34,35,40)(27,37,38,28)(31,32,33,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.